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From 7530a2f3975b76711467226f8b279baf36d92e46 Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Tue, 6 Sep 2016 21:45:05 +0200
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Subject: [PATCH 1/2] Fix backport of "target-i386: add feature flags for
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CPUID[EAX=0xd, ECX=1]"
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <1473198305-8442-1-git-send-email-ehabkost@redhat.com>
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Patchwork-id: 72260
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O-Subject: [RHEL-7.3 qemu-kvm PATCH] Fix backport of "target-i386: add feature flags for CPUID[EAX=0xd, ECX=1]"
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Bugzilla: 1371619
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Upstream status: commit 0bb0b2d2fe7f645ddaf1f0ff40ac669c9feb4aa1
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commit 5fcaf5176d7545518c76f3aa8ea7ce6fb063c62d (the backport of
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upstream commit 0bb0b2d2fe7f645ddaf1f0ff40ac669c9feb4aa1) had a
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serious bug: as the qemu-kvm-1.5.3 code doesn't have
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FeatureWordInfo and loops for assigning cpu->features,
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cpu->features[FEAT_XSAVE] was always zero, so that commit
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basically cleared all XSAVE feature bits in all CPU models.
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Fix it by handling FEAT_XSAVE everywhere it matters: in the
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plus_features/minus_features handling, in the loading of CPU
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model definition, and kvm_cpu_fill_host().
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target-i386/cpu.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/target-i386/cpu.c b/target-i386/cpu.c
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index 80106ba..1001c47 100644
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--- a/target-i386/cpu.c
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+++ b/target-i386/cpu.c
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@@ -1201,6 +1201,8 @@ static void kvm_cpu_fill_host(x86_def_t *x86_cpu_def)
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} else {
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x86_cpu_def->features[FEAT_7_0_EBX] = 0;
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}
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+ x86_cpu_def->features[FEAT_XSAVE] =
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+ kvm_arch_get_supported_cpuid(s, 0xd, 1, R_EAX);
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x86_cpu_def->xlevel = kvm_arch_get_supported_cpuid(s, 0x80000000, 0, R_EAX);
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x86_cpu_def->features[FEAT_8000_0001_EDX] =
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@@ -1281,6 +1283,9 @@ static int kvm_check_features_against_host(X86CPU *cpu)
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{&env->features[FEAT_7_0_EBX],
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&host_def.features[FEAT_7_0_EBX],
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FEAT_7_0_EBX },
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+ {&env->features[FEAT_XSAVE],
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+ &host_def.features[FEAT_XSAVE],
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+ FEAT_XSAVE },
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{&env->features[FEAT_SVM],
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&host_def.features[FEAT_SVM],
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FEAT_SVM },
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@@ -1819,6 +1824,7 @@ static void cpu_x86_parse_featurestr(X86CPU *cpu, char *features, Error **errp)
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env->features[FEAT_KVM] |= plus_features[FEAT_KVM];
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env->features[FEAT_SVM] |= plus_features[FEAT_SVM];
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env->features[FEAT_7_0_EBX] |= plus_features[FEAT_7_0_EBX];
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+ env->features[FEAT_XSAVE] |= plus_features[FEAT_XSAVE];
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env->features[FEAT_1_EDX] &= ~minus_features[FEAT_1_EDX];
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env->features[FEAT_1_ECX] &= ~minus_features[FEAT_1_ECX];
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env->features[FEAT_8000_0001_EDX] &= ~minus_features[FEAT_8000_0001_EDX];
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@@ -1827,6 +1833,7 @@ static void cpu_x86_parse_featurestr(X86CPU *cpu, char *features, Error **errp)
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env->features[FEAT_KVM] &= ~minus_features[FEAT_KVM];
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env->features[FEAT_SVM] &= ~minus_features[FEAT_SVM];
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env->features[FEAT_7_0_EBX] &= ~minus_features[FEAT_7_0_EBX];
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+ env->features[FEAT_XSAVE] &= ~minus_features[FEAT_XSAVE];
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out:
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return;
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@@ -1962,6 +1969,7 @@ static void cpu_x86_register(X86CPU *cpu, const char *name, Error **errp)
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env->features[FEAT_SVM] = def->features[FEAT_SVM];
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env->features[FEAT_C000_0001_EDX] = def->features[FEAT_C000_0001_EDX];
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env->features[FEAT_7_0_EBX] = def->features[FEAT_7_0_EBX];
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+ env->features[FEAT_XSAVE] = def->features[FEAT_XSAVE];
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env->cpuid_xlevel2 = def->xlevel2;
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object_property_set_str(OBJECT(cpu), def->model_id, "model-id", errp);
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--
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1.8.3.1
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